Typewriting machine



y 1932- w. F. HELMOND 1,361,009

TYPEWRI'IING MACHINE Filed July 31, 1929 2 Sheets-Sheet l //2 Van far:

,4 ffargey May 31, 1932. w. F. HELMOND v 1,861,009

TYPEWR ITING MACHINE Filed my 31, 1929 2 Sheets-Sheet '2 mwm Patented May 31, 1932 PAT T crema- I aspirat iat wesac mamsn, coNNEcT'IonT, 'Assienoa'ro Huntsman 'ELLIo rrIfsHE 3a COMPANY; ornfriw'Yonxjn. Y., A CORPORATION 'or' DELAWARE I ":r'YPEufiii'ri-NG MAcHIrIE This invention relates to V the" paper-carriages of typewriting machines; such-as the Underwood jand especiallyto'fimprovements inmeans whereby the work-sheet is guided around the platen. c

'One of the objects of the invention is to-fa cilit'ate -the introduction and', adjustment of thework-sheet or pack owork-sheets,and to improve the feeding of thesheets, and to decrease the noise of operation, especially of the sheet metal" frame inwhich the platen is mounted. I L

' It is usual inv the Underwood machine to employ at tlieb'ack of the platen a= paper-shelf which is fastened upon the platen-frameand Xtends downwardly and forwardly to the platen, andaround under the same andup in front. This device; ifina'deso strong that it will control a pack of work-sheets, is so stiii that it issornetinies*diflicult to manipulate the sheets in the machine, and:- it does not" aiiord sufficient clearance for the sheets in'all cases. A featureof the 1 invention is to cut oii the paper=she1f at a point that is about level with i the platerr-axle,- and toiprovi'de an indpen'd ent downward continuation" of said papershelf in the form ofa hinged: paper guidin'g apron, which is hinged just belowthe bottom edge ofthe paper-shelfand continues downwardly and forwardly and curvesarOund the bottom of the platenand' up-in frontithereof; This paper-'guidin'g'apron has aspringiwhich tends to lower it from-the platen. The apron is held up, h'ovvever, by meansof rubber: pads, which "are provided upon vthei shafts which carry the usual releasable rearand: "front rolls. Thepap'er-apron isheld up'iin correct' positio'n by these ads and they use-aid in deadening the vibration and noise. When the feed-rolls are cast off "frc'm the platen, the

j pads drop therewith, together with the paper-apronre'sting thereon, which 'at this time curves about concentri'callyfwith r the platen and leaves ample ace for the intro duction" oi alth'ic'k pack of sheets; and isfa'lso "convenient for the} introduction dqwn'wai'dly of sheets" in frontof'the'pl'aten; y I

Saidfe'ed rollsar'e cast ofi' by means ofa reek-shaft whih extend tiltin the platen and below the -samefiand is prcvidefl with The vibration of the aforesaid paper-shelf is dealdened by means ofa padwhich is compacied between the same and the platen frame ac Other features and advantages Will hereinafter appear. I

In the accompanying drawings,

Figure 1 is a front perspective 'view,-partly broken'away, showing the platen i'ranie. of an Underwood 'typewriting machine'provl'decl wlth th present improvements.

Figure-2 is a sectional side elevation, showing the parts in normal: positions.

Figure 3'isisimilar to Figure 2', butsh'ows asn'ialler platen, and'shows the fee'd -rollscast Figure 4 is a sectional side elevation toil lustrate the "manner of bending one of the hangers that carry the roll-releasing camshaft. c I

Figure 5 is a perspective rear end view'of the platen-frame and, other parts.

- Figure 6 is a detail of mounting of the padcollars on the feed-roll shafts.

Type-bars lOstrike upon the front'of'a platen 1 1, having an axle I2 wherebyitis journaled in the ends 13, 140i aplaten-frame, said ends: being joined bya tie-barlfi, which is iastened'by scrwslfit'o flanges 17 bent in from the platen franie ends;

Upon the'bottom' of the platen'run large rear rolls 18 and small front rolls 19,' which may be dropped away from" theplaten to release :the work-sheet; the usual release-key being shown at 20, pivoted at Qito the platen-v frame,i'and connected by alink 22 to a crank 23 provided upon a release-shaft 24.

-At each endof the release-shaft are formed cutaways 25, 26 upon its opposite sides. These cutaways are occupied by the ends? foi' arms 27 forthe rear rolls; and arms 28*for the front rolls. -Said arms form p'ortions" of bell-cranks that are loosely ouin'aled' upona tie-rod 29 that connects the ends of the platen-frame.

The rear rolls are loosely pivoted upon a shaft 30, carried by arms 31 extending rearwardly from the tie-rod 29 and joined to the arms 27 to form bell-cranks. The front rolls are supported upon a shaft 32 carried by bell-crank arms 33, joined to or integral with the arms 28 to form another set of bellcranks. Springs 34, 35 of usual construction press the arms 31, 33 toward the platen, to give the rolls 18, 19 the desired work-feeding pressure upon the platen.

The work-sheet may be introduced at the rear upon an upwardly-and-reai.'wardly inclined paper-shelf 36, and guided downwardl and forwardly between the platen and the eed-rolls, and thence up to the front of the platen. The paper-shelf 36 is fastened by means of screws 37 upon the tie-bar 15, and has a rigid relation to the platen-frame, but terminates at a point that is about level with the platen-axle, instead of continuing downwardly and forwardly under the platen, as

heretofore in Underwood'typewriting machines.

A paper-guiding apron for the under side of the platen is made separately from the paper-shelf, and is hinged at its upper end at. 38 to the platen-frame by means of a pintle 37" mounted in the platen-frame-ends. From this hingethe paper-apron extends downwardly and forwardly to the rear rolls 18 and past the same, and then forwardly under the platen at 39 and upwardly past the front rolls, terminating in an upwardly-and-forwardly projecting lip 40. The hinged apron is provided with cutaways 41 for the rolls, of which a number are provided upon each rollshaft, Figure 1, said cutaways extending through the front end of the hinged paperapron.

Weak leaf-springs 42 extend down from the ends of the paper-shelf 36, and are caught in eyes 43 provided upon the rear ofthe paper-apron, and tend to swing said apron downwardly and constantly press the apron down against annular soft rubber or felt pads 44. provided upon collars 45 that are mounted upon the ends of the roll-shafts 30, 32. These rubber pads have a dampening effect upon the vibrations of the paper-apron, and reduce its noise. A

One of the aims of the invention is to increase the clearance for the introduction of the work-sheets under the platen, and it is for this reason that the paper-apron is made separately from the fixed paper-shelf, and is hinged atsuch a point that its forward edge 40 will swing down far enough to form an ample throat for the introduction of paper either forwardly or backwardly under the platen, as at Figure 3. The curvature of the paper-apron and the position of its hinge sition, Figure 3, it is about concentric with the platen, leaving a wide-open throat or chute for the paper around the bottom of the platen. This is a convenience, especially in inserting sheets downwardly in front of the platen, as at Figure 3, the sheet being introduced between the platen and the usual type-guide 47. The soft rubber pads 44 (which are in the form of rin s confined in peripheral grooves of metal collars 45, held by headed screws 49 upon the loose ends 50 of the roll-shafts, Figure 6) not only dampen the vibrations of the paper-apron, but also position the same properly near to the laten after the work sheet has been introduced, the sheet being pressed against the platen preferably by the rolls and not by the paper-apron.

As seen at Figure 3, in order to provide for a spacious work-chute under the platen, the latter may be reduced in diameter from the standard Underwood measurement, and the platen-axile may be set forwardly a little, so as to bring the front of the reduced platen to proper printing position with reference to the types. I

At Figure 2, the positions of the parts are shown for feeding the work-sheet around the platen. The release-key 20 and shaft 24 are in normal positions, and it will be seen that the roll-releasing arms 27, 28 are contiguous to the flattened portions of said shaft 24. If it should happen during manufacture, or during shipment, or in using the machine, that said shaft should get a little out of true, it would tend to swing either the front or rear roll away from he platen. This fault would also be apparent when the rolls are released, as at Figure 3, at which time either the left-hand or right-hand portion of the hinged paper-apron would be raised by one roll off from the other roll, according to the faulty positioning of the release-shaft 24. To meet this difficulty, the hangers 51, which support the release-shaft 24, and which are fastened by pins 52 to the ends of the tie-rod 29, are formed with cuts 53, which leave a thin neck 54 to join the ends of each hanger, these necks being sufficiently thin to permit, bending of either hanger either forwardly vor backwardly by means of pliers, as indicated by dotted lines at Figure 4. By this adjustment, the position of the front and back rolls at either end of the platen may be readilycorrected.

The release-shaft 24 passes through an eye 55 in a bracket 56, the latter being mounted onithe middle 'of tie-rod 29, and atits lower end carrying a shift-roller 57. The releaseshaft 24 may be reduced at 58, where it passes through said eye, so as to afford clearance to permit 'thebending of either hanger 51.

At its lower end, the paper-shelf 36 may be provided with a longitudinal rib 59 bordered by a tubular head 60 at its lower edge, which is adjacent the hinge 38 of the paperapron, said rib being in the same inclined plane as the paper-apron, and the work-sheet beingdirected properly to the bight of the platen andthe rear feed-roll.

For further dampening or reducing the vibration of the platen-frame, a thick pad of felt 61 is held against the back of the paper shelf, being inserted between the same and the tie-bar 15, and being held thereto by the screws 37. This pad extends down to thef bottom of the paper-shelf, and itsv low-9r end paper-guiding apron hinged in juxtaposition to said lower edge, and inclineddownwardly and forwardly therefrom and curving around the bottom of the platen and up in front thereof, a spring tending to swing said paperapron down from the platen, soft pads, down against which the papereapron 1s pressed by the spring, a set-of feed-rolls running upon the under side ofthe platen, spring-supported arms carrying said feed-rolls, said pads being mounted upon said arms, a cam-shaft extending along the platen beneath the same, supports for the ends of said cam-shafts, and

a key for rocking said cant-shaft to swing the roll-carrying. armsdown; from the platen, said cam-shaft supports being independently adjustable forwardly or backwardly.

2. In a typewriting machine having a revoluble platen and a carriage, including a platen-frame, the combination of a paper-shelf in. rear of the platen and inclined downwardly and forwardly and terminating with'its lower edge about level with the platen-axle, a'

paper-guiding apron hinged in juxtaposition to said lower edge, and inclined downwardly and forwardly therefrom, and curving around the bottom of the platen and up in front forwardly or backwardly to true the camshaft. I p r 3. In a typewriting machine having a revoluble platen and a carriage, including a plat-- eneframe, the combination of a paper-shelf in rear of the platen and inclined downwardly and forwardly and terminating with its lower edge about level with the platen-axle, a paper-guiding apron hinged in juxtaposition to'said lower edge, and inclined downwardly and forwardly therefrom, and curving around the bottom of the platen and up in front thereof, a spring tending to swing saidpaper-apron down from the platen, soft padsdown against which the paper-apron is pressed by the spring, a set of feed-rolls running upon the under sideof the platen, and spring-supported arms carrying said feedrolls, said soft rubber pads in the form of rings, said rolls mounted upon shafts, each shaft having at each end a collar having a peripheral groove to carry said pad-rings.

4. In a typewriting machine having a revoluble platen and a carriage, including a platen-frame, the combination of a paper-shelf in rear of the platen and inclined downward ly and forwardly and terminating with its lower edgeabout level with the platen-axle, a paper-guiding apron hinged in juxtaposition to said lower edge, and inclined downwardly and forwardly therefrom, and curv ing around the bottom of the platen and up in front thereof, a spring tending to swing said paper-apron down from the platen, soft pads down against which the paper apron is pressed by the spring, aset of feed-rolls run-' ning upon the under side of the platen, springsupported arms carrying said feed-rolls, saidpads being mounted upon said arms, a cam shaft extending along the platen beneath the same, a key for rocking said cam-shaft to swing the roll-carrying arms down from the platen, said platen-frame having a tie-rod,. hangers fixed upon said-tie-rod and formed with bendable necks, and a releaseshaft mounted in said hangers and having an operating key. I I

' WILLIAM HELMOND.

thereof, a spring tending to swing said paper-,

apron down from the platen, softpads, down against which the paper-apron is pressed by the spring, a set of feed-rolls, runningupon the under side of the platen, spring-supported arms carrying said feed-rolls, said pads being mounted upon said arms, a cam-shaft extending along the platen'beneath the same, and a key for rockingtsaid cam-shaft to swing the roll-carrying arms down fromthe'platen,

I said platen-frame having brackets in which the ends of said cam-shaft'are mounted, said brackets having thin necks readily bendable 

